Drilling machine



I May 14, 1935. L. J. FELLAY 2,001,058

Filed June 28, 1954 4 Sheets-Sheet 1 May 14, 1935. L. J. FELLAY DRILLING MACHINE Filed June 28, 1934 4 Sheets-Sheet 2 May 14, 1935.. L. J. FELLAY 2,001,058

DRILLING MACHINE filed June 28, 1934 4 Sheets-Sheet 3 Patented May 14, 1935 mmLL NG limits .1. Fllay, Reoria, 111.; assignor an money Broa, Te'oria, $111., ia recuperation infilllinois '16 "Claims.

il'his invention ghas reference ito .drilling machines and although not limited in itsrapplication is preferably adaptable @to -maehines of ,the .eoa and rooktdrilling type.

J-I'he invention has for its principal vobject :to provide a safety elutch means operable under certain:drilling operations whereby to control -.the actuation ofithe thread or feed bar, which Lcarries in association [therewith the usual auger tor drilling tool. v V

Ehe invention has :forr-a furtherrobject an :improved Jiner -or feed-nut ,assembly, operable in association with ssaid clutch "means, which effects thefiurward-feeding (and retraction of the thread or feed bar r-through .said drilling maohine 1toward and away drom-the -material being worked A further object of the invention is to ,com- ,pletelylhouse'or enclose saidmlutch means and said ,liner eassembly, so that the operating elementsithereof areiout ofreagh and ..0 1lt0f contact with .the relothingiand body of an attending workman, thereby making the machine :and "the ,attendants to its drilling operations a safe one.

fl he invention I has :1 or y a --still further iobj eat to 'provideaa manuallyncontrollable leverior operating means located on the exteriorof said :housing and -conneotediwith said clutch means andsaid liner xassembly adapted sfor movement ,by an :attendant 'to one position, whereby to ieause the liners of saidiassembly'to have threaded engagement with a rotative thread nor Jfeed ,bar and simultaneously actuating said elutch means :to

causezsai d linerassembly to .belnon rotativeavith said .threador feed :bar, and vfurther -.to enable said thread or feed bar :to be trotativelyv.fed ithroughrsaid non-irotativelinen assembly andtsaid machine; said lever or :operating v means movable to an intermediate position, whereby @the 1 liners of (said iassembly :retain their :threaded xengagement with said :rotative threadior feed r-bar,-and simultaneously (actuating said -.cluteh .:means ito cause; said liner assembly -to become :rotative with 'said thread or feed bar, athereby stopping the .feeding1=movement of said bar throughisaidliner assembly and :v-said ,machine; ,and :said lever .or operating ,means ,movable to another :position, whereby the ,liners of saidassenibly are .eaused .tobeseparated: and; disengaged irom saidrotative thread ion-feed. barand non-rotative :therewith, mherebwto permit aimanual Yse lective positioning of said thread or feed bar with respecmtozainew drilling operation, that is, the thread or A teed .Abar

.in this position :of the lever .or operating means .mayirbe (manually tpulled tor, pushed by an rattendantihrough the fiparateiiiliners of the assembly ,to assumepa .new or -selective positioning ofisai'di barrwhensnot. desiring itoace'omplish sueh positioningby meanstofithelliner, assemblyhaving the thread or feed Thar fied lthere'through in a forward or 'bakward trdtative movement.

Other (and iurther fidh'jedts will more .fully appear .fro'm lthe fidll'owing description.

ZIIhalt the invention mayfbe more ziiilly understooireiereneeiislhadutothelaccompanymgdrawings .forming .a gp'aiit of this description and illustrating a ,preferred Ienibo'iiimen't of theinventi'on, in whihi V ,Eigfl is iaiiragmentarydilan View of my improvediflrilling mariliineiincorporating myfinvention, the. manually .controllalilellever or operating means, shown ,in iitiill'llines, :anfi (illustrating in flottedL'lines dither operating positions Lthereof I'Eig.l2 ;is a .paiitial,sedtional View in elevation as ,the same ,WOlild appear .if taken on *the line Ze ZQFigILJthe clutch means andliner assembly thereoflillus'trateii "in 'thiemositionl'theywvoiild. assume when the manually nontrdllable lever or operating means, shown in fulli'lineaf in Fig. 1 ,fis moved ,to the right fhan'd dottedyiline ,pos'ition, shownin -saidfigum;

Fig, '3 is a view .somevzhats'imilar to Fig. *2

illustrating the .oluth means andfliner assembly I in vthe .positionslthey .wmild .assume with the manually icontrollalile'levler "or operating means in the .iiu'llline position, as it js. shown iinFig. "1;

lliig. lisia viewjsiniilar .toIEigs.12 (and3, show- 'ing .the i'e'luteh .means and liner .assenilc'ily inthe positions 'they twoiild'iassume when the manually ,contrdllable lever .91: operating .means is moved from .the (11111 line position, asshown iniliig. l andfldtailed finillg. L3, "to the lleift Zhan'd dotted line position asdllustrated in'l igfl;

Eig. 51 5 3156601011931 view :in elevationjlookingf in the directionhi .theiarrows as ,Zthe same would appear; if [taken on the line '"5-"5,LFig. 14, said figlures illustrating the liners of the liner .assembly separated or disengaged from the thread .or ,Ieed bar;

Fig. .IB ,lis a ,partial seetional iview in elevation, looking linthe-direetiontdfithe arrowatas the same would appear if "taken on ithe'jiline 6- .6 of fig. 1 audit ,takenton .t'heiline 5-45 of Fig.

,-Eig.'.7 .is palseotionaliviewlinelevation showing sembly comprising the liner cage with its plain and spline hub ends, showing one of the interiorly threaded liner members and the liner shifter ring encircling said liner cage in section;

Fig. 9 is a sectional view in elevation of the driving gear hub and thread or feed bar, looking in the direction of the arrows, as the same would appear if taken on the line 9-9, Fig. 2; V

Fig. 10 is a side view in elevation, partly broken away, of the dental clutch forming a part of said clutch mechanism of said machine;

Fig. 11 is a bottom plan view of the shifter clutch engagement member, which cooperates with the dental clutch illustrated in Fig. 10, the circular-like finger portions thereof which cooperate with the shifter ring illustrated in section in Figs. 2, 3, 4 and 8, being broken away, said circular-like finger portions shown in full section in Fig. 6;

Fig. 12 is a fragmentary view, illustrating in side elevation, one end of the liner members, shown in assembledor juxtaposed position, and

Fig. 13 is an end view elevation'of the liner members illustrated inFig. 12.

Like characters of reference denote corresponding parts throughout the figures.

Referring to the drawings, particularly Fig. 1, i designates the thread or feed bar main housing upon one side of which is provided a turn-table support member 2 which is'adapted to cooperate with a similar turn-table support member on a drill post, not shown, for supporting and permitting swivel movement of the drilling machine when mounted for drilling operations. A motor mounting lug or support 3 is provided on said housing I preferably opposite said member 2 having an opening 4 therein for the secur'ement and adjustment of preferably an electric reversible motor, not shown. main'housing I is provided a gear housing 5 comprising a main body portion A andan off-set portion B, said, portions A and B enclosing meshed gears, notshown. [The driving gear in the off-set portion B is adapted to be connected by suitable shafting, not shown, to the motor, not shown, for imparting rotative movement to said gears and thereby rotate the thread or feed bar C in a manner to be described. 7

The hub end of the thread or feed bar. driving gear 6 which is' disposed within the main body portion A of the gear housing 5 is best seen in Figs. 2 and 9, although illustrated in Figs. 3 and 4. The thread or feed bar C is not unlike in construction the usual feed bar in'drilling machines of this type, and is threaded throughout its length and is provided with oppositely disposed grooves l extending preferably throughout its length into which are adapted to be received the interiorly disposed driving lugs 8 of the gear 6 which, when the gear 5 is'rotated will impart rotation to the. barC, as will be understood.

A liner housing 9 is suitably connected to the inner end of the main body portion A of the gear housing 5 to. which is suitably connected at its forward end a preferably split tube support I0 into which is'preferably frictionally held an elongated protecting tube or sleeve II which functions as a guard and protection against the body or clothing of an attending workman coming into contact with the bar C when rotating and causing possible injury.

Disposed within an annular shoulder of the main body portion A of the gear housing 5 is an outer race l2 of a roller bearing assembly, the inner'race [3 thereof providing a bearing On the inner end of said support for the hub end of a dental clutch member I4 seen in Figs. 2, 3, 4 and '7 and shown in detail in Fig. 10, said member being provided on the periphery thereof with a plurality of clutch teeth I5. The hub end of said dental clutch member I4 is in axial alignment with the hub end of the driving gear 6 and abuts the same. The main body portion of the clutch member I4 is somewhat off-set to the hub portion thereof to provide an inner well portion, as disclosed, the inner annular wall of said off-set portion being provided with a plurality of recesses for the reception of the spline-fitted hub end I6 of a liner cage ll, said cage illustrated in detail in Fig. 8. The end wall l8 of the cage ll preferably abuts the outer end face of the off-set portion of the dental clutch member I4, as shown. The hub ends l6 and I9 of the liner cage H are likewise in axial alignment with the hubs of the members l4 and 6, through which, including the housing 1, is adapted to be received the thread or feed bar C. i

The opposite end hub I 9 of the liner cage I! is smooth faced and is received within the tube support If] and has a bearing relation with a bearing member 20 provided therein. The companion end wall 2| of the cage l1 likewise preferably abuts the bearing member 20. The end'walls I8 and 2| of the cage H are connected together by two oppositely disposed and relatively thin side walls 22, 22, the height thereof being preferably considerably less than the height of the end walls, as indicated in elevation, see Figs. 2, 3 and 4. The inner faces of said side walls are flat and the outer faces thereof are rounded in contour to conform to the peripheries of the end walls l8 and 2!, see Figs. 5, 6 and 8. I

Adapted to be operatively disposed and carried within said cage I l is a pair of separable threaded like-formed liner members 23, 23 and the description of one will suffice for the other. The ends of the liners are provided with upstanding end walls 24, 24, the outside faces of which are preferably smooth to facilitate their movement within the cage I! when assembling and separating the liners for certain drilling operations, to be described. On the outside of each liner and extending substantially throughout the length thereof is a centrally disposed cam-like member'25. Said member, see Figs. 2, 3, 4 and 8, near one end, provides a flat riding surface 26 which extends downwardly as at 21 to the body of the linerto provide a further flat portion 28 which meets forwardly with an upstanding and somewhat taller flat portion 29 than the surface 26, said portion 29 forming with its connection with the portion 28 a V like wedge as at 30, said inclined face or jaw of the portion 29 designated 3|. The underside or inner surfaces of the half section liners are screw threaded to fit the screw threads of the feed bar C. Portions of the length of each of the meeting faces of said liners are serrated as at 32 so that when the liners are assembled in closed bar feeding position about the feed bar C, the liners will be guided into proper threaded engagement with the feed bar C and be prevented from wobbling and thereby maintain the liners in proper alignment with respect thereto. The liners are illustrated in assembled position in Figs. 12 and 13 and shown within the cage l! in Fig. 8.

A liner shifter ring 33 is adapted to have a sliding fit with the rounded outer faces of the side walls 22, 22 of the cage H, see Fig. 8, and to also amounts they are in arclosed orassembled positioniabout the feed bar C, as shown in Fig.2. I

Re'ferring to Figs. 1, 2,?3, 4 and 6, ithe liner housing 9 pivotally sup ports anoperatingEhandle or lever arm M at-3 5,=said handle having a slot-or opening therein in which ie slidably mounted a pin 36 which =extends 'dovm through and is slidably airrange'cl. in anelongated slot or opening in the housing 9 to which' pin is suitably connected an longalted'shifter meniberfi 'l which is adapted tobe actuated in and lengthwise of said housing 9 by said l'ia-ndle -or ai-"in' it, the -ends or said shifter 'rneniber 'being received in their extended positions in {slots 28B, 88 in thehousingsfli and it,

respectively. At the:eonnection oif said shifter member-'31 to said p'in '136rthere'is provided a yokelike 'merriber comprising downwardly curved arm's 39, 39, see Figl fi whioh are adapt'd to be received in an annular-groove*orireeessmfl=provided in said shifter ring "33, whereby when ithe shifter rnember 31 is =aotua'ted lengthwise of the housing ft hymeansof the handleorarm fl lgthe'shifter ring 33 will be likewise actuatediwith said shifter members i.

Rearwardly the connection of said yoke'members 393 9 to said sliift'er niemberhl, and onthe underneath side thereof -'there is -'p rovided a depending engagement member il thereon adapted to cooperate with the teeth idof the dental clutch M. The forward-iface oi theshiftei ring' 33 is beveled-as-at 4:2 to-cooper-ate withthe diagonal jaw Y faces -v'il I of =the-iiners-,- for'purposes to be" described.

Assuming the forward end of "the thread or feed bar G, whioh is protec'ted by the "sleeve i i is in position"fora-drilling operation, the; operatoror attendant will 'move the handle or arm 34 toth'e righ't hand-dotted line position shown in Fig. 1 which is that position shown'in detail in Fig. The operator will next start the motor, not shown, which will impart rotative movement to the gears withinthe-portions A and Bof the housing fi, thereby rotating the driving gear hub 6and-the thread or feed b'ar C. *With the handle 34 in-the position shown in Fig. 2, the shifter ring 33 has caused-the threaded liners Z3, 23 within the cage i 'i te -movetowarWtheieed-bar C and become threadedl-y associated therewith whereby toast-as a nut andcause the threador feed bar C to be rotatively fed' forward toward the work to be drilled, *Simu'ltaneous with the movement of said handle i-M to the position just -described, including the yoke like -merribers 39 39 and shifter ringi3'3fithe engagement member d l of the shifter :member 1W will be-caused to have :an immediate clutoh engagemerit with the teeth i5 of the den'ta'l clutch M, thereby making station ary and preventing rotative movement of said dental clutoh'member M, the cage H by-'reason of thesp'line 'fitting connection H5 with saiddental clutch member 1 4, and the assembled liners 23523 within 'said cage H. Inother words, with the parts in the position illustrated in Fig. 2, the thread -or feed bar Cds fed rotatively -'forward through the stationary assembled liners i23, 23 :as =1ongas the moton not shown, is openated. in :most rdrilling :machines, the driving :motorsaare :reversibie. Infthe event the motoris oreversed' withithe :parts in .:.the :position-as shown :iniEig. .2, itiwill :bezunderstood "that. the extended thread or feedibar:C willz.be caused to be'rotatively 'feid" .backwardly :without any disturbance :of the LIIQSltiOIl .ofitheihandle fikzas it.:is;shown in Fig.2. ,"With the :movement LQf the :handle :or-lever arm 34 :to ithe ifullilinezpositiomishown inEig. 1, the parts assume the :position as :shown in detail ;in Figs/3 and :In this iposition .of the ihandle 3161, the forward .ffeeding movement of .ithe thread or feed bar 'C is stopped,ihowevenithemotativeimovemerit :tof rsnoh ifeed E'bar LC continues with :the

operation ofitheidrivingzmotor, mot shown. it often occurs iin drilling operations where ,;it 'is desirable :to "clean-outthe drilled hole by means of stopping :thedforward iifieeding -movement of the :feed "bar and zeither continuing the irotation of the feed bar or'reiversing'suchzrotationiof the feed :bar within the :hble, which "will ithrow out or teed back any ic'ollecte'd :drillings, idirt, cetci, withinithe hole.

Referringnow perticularlyzto tF'ig. 3 it will be observed that theishiiter iring 313 has :'been advanceda'al-ong .the' fiat .r'iding surface .26 of the cam-like member :25 :of the liners I23, .23 but with saidiliners .still :retaining "their assembled and threadedzengagementuwith theathread or :ieedbar iSimultanleous .with the :movement of said .shiftenrihgfiii ibyrmeansbof the: lever-34 and wokelike members 39, 39, the movement of said shifter memberl3l with saidishiiterrring t3 'will cause theiengagement member 41 to declutch withtthe teeth t5 of the dental :clutch [4, thereby permitting the members comprising the dental clutch it tyithe icage ii! with 'lits :spline hub end 46 interfitting itheclutch 1 4,. and the assembled linersfifi, 23 withinsaidnage :lr'l itozrotate with the rotating thread "or feed bar'C. In view-of the cage'l'i and the assembled liners 123, '23 therewithin ithreade'd engagement with said feed bar, now free and capable of rotating with said in detail in' Fig-s. 4 and '5 ":In this position-of the.

handlete, assuming'that the driving motor, not

shown, is running: and the hub end of the driving gear '5 is imparting rotation to the thread or 'feed bar C, the-liners 23, 23 are disengaged with said ieed bar, therefore, no feeding :movement is imparted to said bar. The-main purpose of providing adjustment or position of the handle 'oriever arm S' E is to enable 'theimanual adjusting or ip ositioningof the thread 'or feed bar C with respectto thework to be drilled. In such case, the driving motor, not shown, is stopped and it will be imders'tood that with the-stopping of said motor the thread "or 'feed bar C will discontinue its rotative action therewith, thereby permitting the operator orattending workman to grasp the 7 free protruding rear end of said bar and either push or pull it through the disassembled-liners 23, 23 to the desired position, whereupon, depending up o nthe instantdrilling conditions, the operator will throw the "lever 34 to either the 'full line position, -as shown-infFigiL'which position is shown inFig. 3, 01' to the right hand dotted line position, as shown in Fig. L which position is shown in Fig. and "the driving motor, not shown, is -againstarted'to effecta forward feeding rotativeaction or "a reverse rotative action or" the feed bar-'0, as may be desired.

Referring now particularly -to Fig.*4, the movement of the lever 3 1 to such left hand dotted .line position as shown in :Fig. ".1, has caused the shifter :ring 33 "to advance along 1 the zfiat riding .surface 25 eof "the cam-dike member 25 :of .the

liners 23, 23 until the beveled face 42 of said shifter ring contacts the diagonal jaw faces 3| of said liners, whereupon in the further advancing movement of said shifter ring 33 to the position illustrated in Fig. 4, the faces 3| of said liners ride upwardly upon the beveled face 42 of the shifter ring 33 resulting in the liners becoming separated and disengaged from their threaded engagement with the thread or feed bar C and so held in said separated position until the lever 34 is moved to one or the other of said previously described positions.

It will be understood that upon moving the lever 34 from the position shown in Fig. 4 to the position shown in Fig. 3, that the rearward resultant movement of the shifter ring 33 will cause the rear beveled wall of said ring to engage the sloping faces 2'1 of said liners 23, 23, thereby depressing said liners, whereupon said ring will ride upon the flat riding surfaces 26 of said liners, as illustrated in Figs. 3 and 6, causing the liners 23, 23 to be closed and assembled upon and have threaded engagement with the thread or feed bar C.

Referring to Figs. 1 and 6, the liner housing 9 and the handle or lever arm 34 are provided with cooperating detent elements, whereby in any of the three adjusted positions of said lever, as shown and described, said lever will be substantially fixed and be prevented from jarring or vibrating and causing accidental displacement of said lever from said fixed positions.

What I claim is:

1. In a drilling machine, in combination, a housing providing a closure, a cage within the housing, a thread-bar operable through said housing and said cage, coacting separable liner sections disposed within said cage and threaded for engagement with the thread-bar, operating means for the thread-bar, and means for moving the liner sections within said cage to operative and inoperative positions with respect to the thread-bar.

2. In a drilling machine, in combination, a housing providing a closure, a cage within the housing, a thread-bar operable through said housing and said cage, coacting separable liner sections confined within said cage and threaded for engagement with the thread-bar, operating means for the thread-bar, ashifter member associated with said liners, manually adjustable means movable to selective positions and having a connection with said shifter member, in one of which positions, said member is actuated causing the liners to function as a nut for axial movement of the thread-bar, in another of which positions, said member is actuated causing the liners to be held for rotation with the thread-bar and in a third position, said member is actuated causing the liners to separate out of operation with the thread-bar.

3. In a drilling machine, in combination, a housing providing a closure, a cage within the housing, a thread-bar operable through said housing and said cage, coacting separable liner sections confined within said cage and threaded for engagement with the thread-bar, operating means for the thread-bar, a shifter member associated with said liners, manually adjustable means movable to selective positions and having a connection with said shifter member, in one of which positions, said member is'actuated causing the liners to function as a nut for axial movement of the thread-banin another of which positions, said member is actuated causing the liners to be held for rotation with the thread-bar and in a third position, said member is actuated causing the liners to separate out of operation with the thread-bar, and means for fixedly positioning said adjustable means.

4. In a, drilling machine, in combination, a housing, a thread-bar rotatively operable through said housing, a cage rotatively disposed within the housing, coacting separable liner sections confined within said cage and interiorly threaded for engagement with the thread-bar, operating means for the thread-bar, a clutch member associated with said cage, a. liner shifter member associated with said liners and said cage, manually controllable means for the clutch member and shifter member movable to selective positions, in one of which, said controllable means prevents the rotation of said clutch member and said cage and the shifter member actuates the liners within said cage to function as a nut for axial movement of the thread-bar, in another of which, said controllable means permits the rotation of said clutch member and said cage and liner sections, said shifter member holding the assembled liner sections for rotation with the threadbar and in a third position, said controllable means causes the shifter member to actuate the liner sections within said cage whereby said liners disengage out of operation with the thread-bar.

5. In a drilling machine, in combination, a housing, a thread-bar rotatively operable through said housing, a cage rotatively disposed within the housing, coacting separable liner sections confined within said cage and interiorly threaded for engagement with the thread-bar, operating means for the thread-bar, a clutch member associated with said cage, a liner shifter member associated with said liners and said cage, manually controllable means for the clutch member and shifter member movable to selective positions, in one of which, said controllable means prevents the rotation of said clutch member and said cage and the shifter member actuates the liners within said cage to function as a nut for axial movement of the thread-bar, in another of which, said controllable means permits the rotation of said clutch member and said cage and liner sections, said shifter member holding the assembled liner sections for rotation with the thread-bar and in a third position, said controllable means causes the shifter member to actuate the liner sections within said cage whereby said liners disengage out of operation with the thread-bar, and means for fixedly positioning said controllable means.

6. In a drilling machine, in combination, a housing, a thread-bar operable through the housing, a cage within the housing, coacting separable liner sections disposed within said cage and interiorly threaded for engagement with the thread-bar, cam-like surfaces provided on the exterior faces of said liner sections, operating means for the thread-bar, and means for coacting with the cam-like surfaces of said liner sections whereby to move the liner sections within said cage to operative and inoperative positions with respect to the thread-bar.

7. In a drilling machine, in combination, a housing, a thread-bar operable through the housing, a cage within the housing, coacting separable liner sections disposed within said cage and interiorly threaded for engagement with the thread-bar, cam-like surfaces provided on the exterior faces of said liner sections, a liner shifter member carried by said cage for coacting with said cam-like surfaces, operating means for the thread bar, and a manually controllable means operable tomove saidshifter member whereby to actuate the liner sections within said cage to operative and inoperative positions with respect to the thread-bar. i r

- s. In a drilling 'machlnej'ln combination, a

housing, afthread bar operable "through the housing, a cage within the-housing, coacting separable liner sections disposed within said cage and interiorly threaded for engagement with the thread-bar,jcain'-like surfaces provided on the exterior faces of said-liner sections, a liner shifter-member carried by said cage for coactingwith said camlike surfacesoperating means for the thread bar, a" manually controllable means operable tomove said shifter member'whereby to actuatethe liner fsectionsjwithin said cage to -operative and inoperative positions with respect to the thread-bam and meansfor 'fixedlyposb itio'ning said controllable means; 1

911m a-drilling machine, in ombination, a housing; a threadbar "operable' through i the mousing-, coactingf separable liner sections operable within said housing and interiorly threaded for engagement with the thread-bar, a plurality surfaces of said liners whereby to actuate the liner sections within said housing to an operative position with respect to said thread-bar, and inanother of which, to move the shifter member in coaction with certain other of said cam-like surfaces of said liners whereby to actu- 'ate the liner sections within said housing to an inoperative position with respect to saidthreadbar.

a housing, a thread-bar operable through the housing, coacting separable liner sections operable within said housing and interiorly threaded for engagement with the thread-bar, a plurality of cam-like surfaces provided on the exterior faces of said liner sections, .a shift member for coacting' with said cam-like surfaces, operating means for the thread-bar, and. a manually controllablemeans for the liners movable to selective positions, in one of which, to move the shifter member upon certain of said cam-like surfaces of said liners whereby to actuate the liner sections within said housing to an operative position with respect to said thread-bar, and in another of which, to move the shifter member upon certain other of said cam-like surfaces of said liners whereby to actuate the liner sections within said housing to an inoperative position with respect to said thread-bar, and means for fixedly positioning said controllable means.

11. In a drilling machine, in combination, a housing, a thread-baroperable through the housing, a cage within the housing, coacting separable liner sections disposed within said cage and interiorly threaded for engagement with the threadbar, camlike surfaces provided on the exterior faces of said liner sections, a liner shifter member carried by said cage for coacting'with said camlike surfaces, operating means for the threadbar, and rnanually controllable means for the shifter member movable to selectivepositions, in one of which, said controllable means causes said shifter member to coact with said cam-like.

10. In a drilling'machine, in combination, a

surfaces of said liner sections and actuate said liner sections within'said cage to function as a nut for axial movement of the thread-bar, in another of which, said controllable means permits the rotation of said cageand liner sections,

said shifter member holding the assembled liner sections for rotation with thethread-bar and in a thirdposition, said controllable means causes said shifter member to coact with said cam-like surfaces of said liner sections whereby to actuate the liner sections within said cage to disengage out of operation with the thread-bar.

12.111 a' drilling mach ne, in combination, a housing, a thread-bar operable through the housing, a cage within the housing, coacting separable liner sections disposed within said cage and interiorly threaded for engagement with the threadbancar'n-like surfaces provided on the exterior faces of said liner sections,- a liner shifter membercarried by said cagefor coacting withsaid cam-like surfaces, operating means for the thread-bar, and manually controllable means for the shifter member movable to selective pOSltions, in'one of which,=said controllable means causes said shifter member to coact with said i cam-like surfaces of said liner sections and actu are said -lin'er sections within said cage to function as a nutforaxial movement of the threadbar, in another of which, said controllable means permits the rotation of said cage and liner sections, said shifter member holding the assembled liner sections for rotation with the thread-bar and. in a third position, said controllable means causes said shifter member to coact with said cam-like surfaces of said liner sections whereby to actuate theliner sections within said cage to disengage out of operation with the thread-bar,

and means for fixedly positioning'said control lable means.

13. In a drilling machine, in combination, a housing, a thread-bar operable through the housing, coacting separable liner sections operable within said housing and interiorlythreaded for engagementwith the thread-bar, a plurality of cam-like surfaces provided on the exterior faces of said liner sections, a member for coacting with said cam-like surfaces, operating means for the thread-bar, and manually controllable means for the liner sections movable to selective positions,

in one of which, to move said member in coaction with certain of said cam-like surfaces of said liner sections whereby to function as a nut for axial movement of the thread-bar, in another of which, said controllable means permits the rotation of said liner sections, said member holding the assembled liner sections for rotation with the'thread-bar, and in a third position, to move said member in coaction with certain other of said cam-like surfaces 'of said liner sections whereby to actuate the liner sections within said housing to disengage out of operation with the thread-bar.

14. In a drilling machine, in combination, a housing, a thread-bar operable through the housing, coacting separable liner sections operable within said housing and interiorly threaded for engagement with the thread-bar, a plurality of cam-like surfaces provided on the exterior faces of said liner sections, a member for coacting with said cam-like surfaces, operating means for the thread-bar, manually controllable means for the liner sections movable to selective positions, in one of which, to move said member in coaction with certain of said cam-like surfaces of said inner sections whereby to function as a nut for axial movement of the thread-bar, in another of which, said controllable means permits the rotation of said liner sections, said member holding the assembled liner sections for rotation with the thread-bar, and in a third position, to move said member in coaction with certain other of said cam-like surfaces of said liner sections whereby to actuate the liner sections within said housing to disengage out of operation with the thread-bar, and means for fixedly positioning said controllable means.

15. In a drilling machine, in combination, a housing, a thread-bar operable through the housing, coacting separable liner sections operable within said housing and interiorly threaded for engagement with the thread-bar, operating means for the thread-bar, mechanism embracing said liners adapted for coaction therewith, and manually controllable means for the liner sections movable to selective positions, in one of which, to move said mechanism in coaction with the liner sections whereby said sections are moved in assembled threaded relation with the thread-bar to function as a nut for axial movement of the thread-bar through the housing, in another of which, said mechanism is operated to coact with the assembled liner sections whereby said sections are held for rotation with the thread-bar, and in a third position, said mechanism is operated to coact with said liners whereby to disassemble said liner sections out of engagement with the threadbar.

16. In a drilling machine, in combination, a

threaded relation with the thread-bar to function as a nut for axial movement of the thread-bar through the housing, in another of which, said mechanism'is operated to coact with the assembled liner sections whereby said sections are held '29 for rotation with the thread-bar, and in a third position, said mechanism is operated to coact with said liners whereby to disassemble said liner sections out of engagement'with the thread-bar, and

means for fixedly positioning said controllable 2;

means.

- LOUIS J. FELLAY. 

